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Added Tachometer to 2018 Road King

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BillyO00769

Guest
Hello everyone.
I added a genuine Harley tach to my 2018 RK. Used proper harness and connectors. Soldered the connections. Everything works great but in DIAG mode: ECU- no errors, BCU- no errors, TACH- no errors but SPDO has a U0157 DTC.
The Gear position/RPM readout on the LCD display on the speedometer now says "GEAR 1,2,3, etc. instead of: 1@ ****rpm (rpm varying depending on engine speed).
It seems that the tach and speedometer aren't communicating properly.
Do I just need a dealer to add the tach software properly via the data port?
The bike is wired just like the police RK. Same gauges. Same wiring. Same connectors.
The wiring diagrams show all touring bikes the same except for radios, aux lights and amps.
 

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So the speedo is on the bars,and the tach is on the tank?
Yes. I first added the tach to the bars but the same speedo DTC error. I put the speedo up there so I don't have to look down 100 times a day to squint at the little lcd screen. Taking my eyes off the road is not good. This way, a quick glance tells me everything.
The police road king has the same setup. Speedo on bars and tach on tank console.
 
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